This color contains the following pigments:

PB72—Cobalt Zinc Aluminate Blue Spinel

Pigment Type

Chemical Name

Chemical Formula

(Co,Zn)Al2SO4

Properties

Cobalt zinc aluminate produces a deep, bright shade of Cobalt Blue

Permanence

Cobalt salts are extremely lightfast and temperature stable.

Toxicity

Cobalt salts are toxic.

History

Since the discovery of processes for mining and purefying Cobalt Blue (PB28) in the 19th century, additional processes for manufacturing and purifying other cobalt salts have become available. Their use as artist pigments has followed.